Les potentiels précoces évoqués par une stimulation acoustiqui Nouveaux résultats

Abstract

The research work carried out during the last years explains only partially the true nature of the short-latency (< 50 ms) auditory evoked responses (PEP) in mai Widespread support is given to the hypothesis suggesting a double origin: myogenic an cortical with varying predominance between the two according to the position of the acti' electrodes and the stimulation parameters. PEP appears to have different characteristic according to the electrode coupling, i.e. inion-lobe, vertex-parietal, and vertex-mastoid.

Experiments carried out on normally hearing subjects, on subjects with norm hearing but with marked vestibular signs, and on subjects with severe hearing loss an normal vestibular findings show that the presence of auditory function is one of the essenti; conditions for the generation of the PEP. Conversely, no influence on PEP is apparel following simultaneous and bilateral inhibition of the steady action potential of the an pullary nerve.

Whichever the theoretical origin of the PEP is, it may be concluded that, since the ri sults obtained during the clinical work are still incomplete and controversial, it is not po sible to consider the PEP as a true expression of the vestibular function.

Key Words:

• Electric response audiometry
• Short-latency auditory evoked responses
• Vestibular function